Gruber's arguments never make any sense. Historically, he changes his opinions more or less based on what Apple is currently doing. He adds little value, and it seems clear that he's making a lot of money as a pro-Apple cheerleader from his blog posts. (Which is fine, don't get me wrong, but it doesn't make him a good news source.)
However, I'm not sure how to get rid of Gruber posts. With certain types of posts, HN can feel like an Eternal September.
http://en.wikipedia.org/wiki/Eternal_September
Certainly the first few times I read a Gruber post, I thought there was some legitimate content there. But now, his posts feel largely like regurgitated commentary on discussions had elsewhere, and his opinions feel utterly discredited by their uniformity.
Without downvotes, and without flags removing Gruber posts, I'm not sure what we can do. Could we possibly, as a community, just agree that a blacklist of Gruber posts is good for us? How would we begin such a discussion?